Three-dimension engraving-machine.



PATENTED AUG. is, 190s.

j No. 736,415.

M. BARE. THREE DIMENSION ENGRAVING MAGHINE.

APPLIOATIOH FILED JAN. 25, 1902.

3 SHEETS-SHEET 1.

No xoDEL.

No. 736,475. n PATENTED AUG. 18,1903.

M. BARR.

THREE DIMENSION ENGRAVING MACHINE.

APPLICATION FILED JAN. 25, 1902.

N0 MODEL. v 3 SHEETS-SHEET 2.

10 Hmm a I afn/6656s. cxvww'e- /W MM* 09' per PATENTED AUG. 18, 1903.

M. BARR. THREE DIMBNsmN maremma MACHINE.

APPLIQATIQN FILED IAN. 25, 1902.

3 SHEETS-SHEET 3.

N0 MODEL.

llllllllll muulllml ullnmnn UNITED STATES 'Patented August 1s, 190s.`

lPATENT OFFICE.

MARK BAER, OE LONDON, ENGLAND, AssIGNoE To THE LINOTYPE COMPANY,LIMITED, or LONDON, ENGLAND.

THREE-DIMENSION ENGRAVING-MACHINE.

SPECIFICATION forming part of Letters Patent N o. 736,475, dated August18, 1903.

Original application filed .Tuly 26, 1900, Serial No. 24,920. Dividedand this application filed January 25, 1902. Serial No. 91,235. (Nomodel.)

To a/ZZ whom it may concern,.-

Beit known that I, MARK BARR, of 25 Kensington Court Gardens,Kensington, London, England, have invented certain new and usefulImprovements in Three-Dimension Engraving-Machines; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, the subjectmatter of thisapplication being a division from that described in a pendingapplication filed July 26, 1900, Serial No. 24,920.

The present invention relates to improvements in three dimensionengraving machines of the type wherein is employed a swingingtracer-rod.

An engraving-machine that can deal only with a plane surface in bothpattern and work has a two-dimension capacitythat is, it can deal withlength and breadth only-but an engraving-machine whose tracer-rod andtool have each a capacity for vertical motion or for motion that has avertical component, such as would be required in engraving the intaglioor the cameo contours of a medal, has a third-dimension capacity; hencethe term three-dimension engraving-machines.

The improvement herein described and claimed relates more particularlyto those en`- graving-machines in which the device for adis beneath thefulcrum-of the tracer-rod.4

Referring to the accompanying figures, which are to be taken as part ofthis specification and read therewith, Figure 1 is a sectional frontelevation; Fig. 2, a side'elevation of an engraving-machine madeaccording to the present invention, and Fig. 3 a front sectionalelevation illustrating the formation of the improved contact-surface forthe topof the tracer-rod.

1 is the frame of the machine; 2, the pattern-table; 3, the patternfixed thereon; 3a, the mean surface of the said pattern, and 4 4 twopieces of work xed on the respective work-tables 5 5.

6 is the tracer-rod. Vhen the latter swings from a given point it mustslide through a spherical fulcrum-joint whose center is coin cident Withthat point to enable the tracerpoint 7 to move over the pattern 3 in anyof the horizontal directions, lateral, diagonal, Or backward andforward. The end 8 of the rod above the fulcruIu-joint would describearcs of different circles havin g a common center were it not that thetracer-point 7 must keep down upon the pattern 3, and thereby depress,so to speak, the two ends of each such arc. The said end 8 willtherefore move in a path approximating in shape to part of a sphere, butat no section of which along any meridian thereof would be presented acontour having a circular arc.

The formation of the contact-surface With which the end S can beconstantly in contact for the purpose of making the tool or toolspartake with precision of the vertical motions of the tracer-point 7forms the subject-matter of the before-mentioned pending application,Serial No. 24,920; but the process of that formation and the meansemployed are both included in this specification for the purpose ofmaking the scope and application of the pres-- ent invention quiteclear. 10 is this contactsurface. The said object is effected asfollows, (see Fig. 3): The block 9, in which the surface 10, Fig. 1, isto be formed, having been duly machined with the exception of that sur'-face is chucked in a lathe in the ordinary way with the face 9, in whichthat surface is to `be cut, outward. A rod 11, carrying a suitablecutter 12 at one end and being then of the same length as the tracer-rod6 from tracerpoint 7 to top end S, inclusive, is mounted O11 a lathe byhaving an equivalent 13 of the fulcruIn-joint 14 mounted in a standard15, which is clamped to the lathe-bed 1G at the same distance from theblock 9 as the fulcrum-joint 14 is from the finished block 9 in Figs. 1and 2, the center of the said equivalent 13 being alined with the axisof the lathe-mandrel 17. A vertical plate 1S is clamped to the lathe-bed16 in the proper relative position to stand for the top plane 3a of thepattern 3. As the abovementioned outer face 9 of the block 9 is stilluncut, the cutter-rod 11 is now standing obliquely between it and thevertical plate 18, the cutter 12 being next to an edge of the said outerface On one side of the axis of the lathe IOO and the opposite end 19 ofit, (and which is the equivalent of the tracer-point 7 at the oppositeedge of the vertical plate 1S. The lathe is then started and thecutter-rod 1.1 moved so as to take the end 19 diametrically across thesurface of the plate 18 in a plane containing the lathe-axis. When -ithas completed this motion, the surface 10 will have been turned outconcave to the particular curve which corresponds with the path followedby the top end 8 of the tracer-rod 6 when the point 7 is moved about andconstantly in touch with the surface 3a. When, however, the said pointmoves in a plane either above or below this surface 3, the ratio betweenthe two portions 8 14 and 14 7 of the rod 6 is changed, therebyproducing` an error in the contact between the top 8 and the surface 10g' but this error is so small that it is practically quite negligible.

The fulcrum-joint 14 of the tracer-rod (i is carried by a bracket 24,made fast to and proj ecting from the standard of the machineframe. Thework-tables 5 5 are arranged about the rod 6-on a plate 20, capable ofmotion in any direction horizontally on a suitable guide in thewell-known way, and this plate is connected to the tracer-rod by aballand-socket joint 21.

The object of the present invention is au improved means fortransferring the vertical motion or the vertical com ponentsof thevertical motion of the tracer-point 7 in either direction to the tools22. These are mounted in suitable guides 23, incorporated with thebracket already described.

25 is a rod from each tool working in a fixed vertical guide 26, carriedby the machineframe.

The top end of a rod 25 is connected by a pin-and-slot device 27 to alever 28, having its fulcrum at 29 in a bracket 30 on the top of themachine-frame 1. The opposite end of a lever 2S is connected by apin-and-slot device 31 to the top of a rod 32, working in a fixedvertical guide 33 and made fast by its bottom end to the top of block 9.As the rise of the tracer-point 7 moves the tracer-rod 6 upward throughthe fulcrum-joint 14 the top end 8 of the said rod bearing against thesurface 10 pushes the rod 32 up through the guide 33 and raises thetools 22 accordingly. 34 'is a spiral spring surrounding the rod A32 andresilient between the guide 33 and the block 9. As the drop of thetracer-point 7 moves the tracer-rod downward through the fulcrumjoint 14the spring 34 pushes the block 9 after it, thereby lowering the tools 32accordingly.

The ratio of lateral dimension between the pattern 3 and the work 4 isadjusted by moving the joint 21 nearer to or farther from the fulcrum-joint 14. It is for that purpose mounted in an eXternallyscrewthreadedsocket 35, engaging in a correspondinglyscrew-threaded socket in theplate 20. The ratio of vertical motion between the tracerpoint 7 and atool 22 is adjusted by moving a bracket 30 farther away from or nearerto the rod 32. For that purpose a bracket 30 slides upon a feather 36 onthe frame 1, the slots 27 in the levers 2S being horizontal orlengthwise thereof, the respective pins of the rods 25 and 32 beingcarried' by the latter and passing through the slots.

The figures illustrate the use of a pair of work-tables 5, tools 22, andconnections to the guiding-surface 10, one set on each side of thelatter; but this number forms no part of the invention and may be variedas may be desired. Further, the vertical tracer-rod 6 and horizontalpattern 3 and guide-block 9 may be replaced by a respectively horizontaland vertical arrangement, the respective positions of the other organsof the machine being changed accordingly.

I claim- 1. In a three dimension engraving -machine, the combination ofpattern;y tracer-rod mounted/in a universal joint intermediate of itstwo ends and through which it can slide; and a concave contact-surfacewith which the end of the tracer-rod, opposite to the tracerpoint, isconstantly in contact when the said tracer-point is moved over the meanplane of the pattern, the said concave surface being a iigure ofrevolution and at no section along any meridian of the concave,presenting a contour having a circular arc.

2. .In a three dimension engraving machine, the combination of pattern;tracer-rod mounted in a universal joint intermediate of its two ends andthrough which it can slide; a concave contact-surface with which the endof the tracer-rod, opposite to the tracer-point, is constantly incontact when the said tracerpoint is moved over the mean plane of thepattern, the said surface being a figure of Arevolution and at nosection along any meridian of the. concave, presenting a contour havinga circular arc, the said contact-surface being movable and havingconnections to the machine-frame; work-table connected by a universaljoint to the tracer-rod between its own fulcrum and its point; toolcapable of variable motion in a fixed guide for depth of cut; andconnections from the contact-surface to the tool by which the verticalmotion in either direction of the former is transmitted to the latter.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

j MARK BARR. lVitnesses J osErH LAKE, CHAs. S. WooDRorFE.

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